No fuel to Carburator

1941 - 1945, MB, GPW Technical questions and discussions, regarding anything related to the WWII jeep.
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Re: No fuel to Carburator

Post by Joe Gopan » Mon Jul 12, 2021 2:40 pm

My first two thoughts are T-2 Filter Gaskets, of the bowl gasket on the fuel pump. My MB starts upon first rotation and about 10 seconds after setting 4-5 months..
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Re: No fuel to Carburator

Post by 501stPIR » Sun Jul 25, 2021 4:55 pm

Still not running. Blew back thru fuel line to gas tank and was clear, heard it bubble in the tank. Pressure test was a failure. No pressure. Fuel filter clear. I ran a fuel line from the fuel pump to a 5 gallon full gas can and tried that. Is it possible that the arm on the fuel pump isn't getting pumped? So frustrating that I'm about to replaces fuel tank to carburator. :x

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Re: No fuel to Carburator

Post by W. Winget » Sun Jul 25, 2021 5:35 pm

Only if the pin came out of the eccentric arm, then it would not move with the cam rotator. It may be a dead pump diaphragm, suffering from Ethanol finally.
Only way to be really sure is pull the pump, mount it in a vise and push the lever up and down to hear/feel the suction or pressure depending on which side you put a finger over.

Now you could put a fuel can on the cowl, run a boat type siphon line down to the fuel pump, prime it then see if it really pumps fuel VS trying to suck fuel all the way from the tank. (once it runs, move the tank to the floor level to see if the pumps pulling the fuel from the tank VS gravity feeding it) If it did run the vehicle, you would pretty much eliminate the pump and carb.

Pull the pump and move the crank, report results...there are kits with new ethanol resistant diaphragms and valves, it's a real simple component.
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Re: No fuel to Carburator

Post by 501stPIR » Sun Jul 25, 2021 5:55 pm

Fuel pump is new but doesn't always mean it's working. Thanks for the tips and will let you know the results.

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Re: No fuel to Carburator

Post by Scoutpilot » Mon Jul 26, 2021 1:30 am

I'm a visual kind of guy. How about some photos of the equipment and setup?
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Re: No fuel to Carburator

Post by Joe Gopan » Sat Jul 31, 2021 7:14 am

Have you had the bowl off the Pump or the T-2 Fuel Filter and did you reinstall new or the used gaskets?
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Re: No fuel to Carburator

Post by '42 Peep's Motorpool » Sat Jul 31, 2021 6:46 pm

Hi,

Sounds like you have a leak in the system admitting air (and breaking the vacuum), but this could be in a number of areas. Since your lines are clear, the pump would be suspect. Pumps can and do fail, either in the valves or diaphragm. Does your pump have a glass or metal bowl on it? I've had glass ones fail (new) on me, so it can't be ruled out just because it's new.

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Re: No fuel to Carburator

Post by Joe Gopan » Mon Aug 02, 2021 9:33 am

Best not reuse the bowl gaskets or the AC-T2 Fuel Filter Gaskets.
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Re: No fuel to Carburator

Post by 501stPIR » Mon Aug 16, 2021 1:18 pm

Well I have finally got around to going thru all the suggestions and much appreciated. I have come to the conclusion that the Lobe on the cam has worn so that it is not coming in contact with the arm on the fuel pump. This after running a primer line from a gas can to the fuel pump and priming the pump to the fuel filter it wouldn't do a thing. Imagine if I could bend the arm a bit one way or the other it may come in contact? But I am looking at going with a EFP as it looks like an expensive fix otherwise. I really appreciate all of you for your help and anything else you would care to share with my decision.

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Re: No fuel to Carburator

Post by Scoutpilot » Mon Aug 16, 2021 1:25 pm

It is not likely the hardened steel in the cam has been worn down by the softer steel of the arm. More likely you have an air leak in the fuel line.
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Re: No fuel to Carburator

Post by thomas68 » Mon Aug 16, 2021 2:50 pm

Try hooking one of the mighty vac brake bleeding pumps to the fuel line at the carburetor. If you get gas, that will show you have no vacuum leaks in the line and probably a fuel pump problem. I used the vacuum pump to prime my system after I hooked all the lines up. I did find a small leak on one of the flare fittings. After fixing it I was able to suck gas from the tank to the line at the carb.
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Re: No fuel to Carburator

Post by moodnacreek » Thu Mar 16, 2023 8:48 am

I went through the gas [to carb] no gas thing for weeks. This is what I found: 2 of my steel fuel line flares where no good enough to seal air. Both the Solex [new] carbs are bad; hole in float, no 'choke' action on one and both have no mid range. The one problem i can not fix is the fuel strainer. While it can be made to work it will not continue to seal. The canister sealing edge is too wide for the gasket and when it becomes fuel soaked this gasket turns over and the canister becomes loose. To fix this you would have to machine off the head edge and make a wider gasket to seat in the middle of the gasket or find a smaller canister. To tell if this is happening tighten the top nut type and pump it full of gas if you can. Come back in 2 days and put a wrench on the bolt. If it is loose the gasket has turned over.

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Re: No fuel to Carburator

Post by dinof » Thu Mar 16, 2023 11:39 am

With the induction of the repo Carter's being made, And the fact they work,
I recommend just buying one, or restoring an old W-O. That Solex just looks
funny on a old Jeep.
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Re: No fuel to Carburator

Post by moodnacreek » Thu Mar 16, 2023 3:32 pm

From what i have been told the Solex was a good design but they, like so many other re-po parts are now made poorly. I had an old WO on the shelf so I took it apart and cleaned it and soaked the leather plunger in oil. Put it back together [replaced nothing] and she runs good and has a nice idle. There is nothing like original parts.

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Re: No fuel to Carburator

Post by dinof » Thu Mar 16, 2023 3:44 pm

moodnacreek wrote:
Thu Mar 16, 2023 3:32 pm
From what i have been told the Solex was a good design but they, like so many other re-po parts are now made poorly. I had an old WO on the shelf so I took it apart and cleaned it and soaked the leather plunger in oil. Put it back together [replaced nothing] and she runs good and has a nice idle. There is nothing like original parts.
And now you can buy the new parts like throttle bodies and re new the old ones even more!
And all the other parts will interchange with the old.
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